Electric meter.



G. A. SOHEEFFER.

ELECTRIC METER.

APPLIOATiON FILED JAN. 14, 1910.

Patented July 16, 1912.

2 SHEETSSHEET 1 G. A. SGHBEFFER. ELECTRIC METER.

APPLICATION FILED JAN. 14, 1910.

' Patented July 16, 1912' 2 sHEETssH1inT 2.

- wstaw ficip'eeffer s ATENT cri ic...

GUSTAVE A. SCI-IEEFFER, OF INDIANAPOLIS, INDIANA, ASSIGNOR 'IO COLUMBIA METER COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

ELECTRIC METER.

Specification of Letters Patent.

Patented July in. 1912..

Application filed January 14, 1910. Serial No. 532,032.

tric lil etersyot which the following is a full,

clear, concise, and exact description, reference. being had to the accompanying drawings, tcrming a part of this specification.

My invention relates to an improved torm of electricity meters adapted to measure a quantity of electricity flowing through any given. circuit.

My improved meter construction provides for accurar.-y of operation, .eas e ot inspection and repair and durability of working parts.

My invention relates particularly to an inn'n-oved form of magnet shunt associated with the retarding magnets used in connection with the rotatable armature cl" a mete ot the class referred to. These shunt members. one of which is associated with each of the. retarding magnets are adjustably mounted from the brackets su 'iporting the permanent magnets so that they may be moved toward or away from the poles as desired and clamped in any position to which they are moved. The supporting members tor the shunts also permit angular motion of the same, as a result of which they may be properly adjusted angularly relatively to the retarding disk carried by the armature shaft and cooperating with the permanent magnets. Stops are prorided in'cimnection with the magnet shunts in order that any particular 11(ljll5t'ltlfilltonce given them may be again secured with-v out (*lloi'l. it for any reason it is necessary to remove them from their supporting brackets as. for example to remove the armature from the meter and to again rcpla c such shunts alter the armature is put. ba lt in operating position. I

The Stl't'l'zll drawings illustrating my invention are as tollows:

Figure 1 is a plan view ot the meter mechanism complete with the. casing thereof removed. and in this figure a portion of the.

field coil is broken away to show more clearly ihe armature windingsand the start.'- mg coil. Fig.5.) is a view froin the lqpveiz endso'i the parts'slmwn in Fig. 1, portions of these parts being broken away to more. clearly show the construction of the apparatius.

Similar numerals rete' to similar parts throughout the several views. I

As shown in the drawings, the base 1 supports an arn'iature shaft 2 by means oi a lower bearing 3 and an upper bearing 4. The shaft 2 carries near its lower end a disk I: of nonma; 'netic material disposed between the poles of pernnlnentmagnets (5 and 7 held in proper position by the brackets-8 and t.) secured to the base plate 1. brackets 8 and l.) are bent at their lower ends so that the outstanding portions constitute bearings upon the plate 1 for such brackets. ln the angles thus formed reinforcing members 95 are placed. such members preferably consisting of strips of metal bent. so as to be engaged by the screws extending through the feet of the brackets'into the plate 1. and also by the screws 93 extending through the brackets 8 and 5) and the magnets supported thereby into the clamping plates 90 and 91. Swen s92 are also employed to clamp the magnets 3 and 7 between the brackets 8 and 5) and the plates 90 and 91. Dowel pins 94.- are secured in the base plate 1 to hold the brackets 8 and t) in proper position thereon. The shaft 2- has mounted thereon three arn'iati'ire coils 10 disposed in operative re lation to a field coil 11 supported by brackets 1.2 from. the base plate 1. A starting coil 13 is also supported from the base plate 1 in suitable manner so as to occupy a position practically parallel. with the field coil l'i the. function of this starting coil being; to exert a rotative tendency upon the armature windings to compensate "tor the friction of the moving parts. A (:Oll'lll'lltltllUl ll is -arried by the upper end ol" the. armature shaft 2 and is connected. with the windings l0. .lirushes to are supported by brush holders lti iron: the rocltcr arm 17 having silver plated bearing portions 15 in such a manner as to rest upon the commutator ll-. The rocker arm' 17 is supported from the upper bearing 4 of the shaft 'lhc rocker arm is rotatably sup 'iortcddiy the upper hearing b'llplle'l't and is adapted to be held in the normal position by means at the clamping screw 33. The rocker arm .17 has secured thereon by means of the clamping screws 3 1- and 35 insulating bushings 3(3 and of the commutator 14 of the armature, the

brushholders 16 having arms 40 extending therefrom toward the commutator 14 and through their ends adjusting screws 41 ex-' tend in such a manner as to rest against the insulating stud 42 supported by the rocker arm 17, which stud 42 thus lies between said screws. The brushholders '16 are held in any desired angular position by means of the clamping screws 43.

Main supporting posts 18 extend outwardly from and are rigidly secured to the base plate 1 and by means of arms 19 support a magnetic shield 20 between the permanent magnets 6 and 7 and the field coil and armature windings. The plate 20 has secured thereto a bracket 21 which forms the bearings'for the-worm wheel 22 engag ing the worm 23 on the shaft 2. The posts 18 also serve to support the integrating mechanism24 shown in Fig. 2.

Posts 25 and 26 extending outwardly from and rigidly secured to the base plate 1, are provided to secure the cover in place to protect the operating mechanism of the meter. A resistance coil 27 is disposed upon the post. 26 as indicated, such resistance coil being connected. in series with the armature as is the usual practice.

The brackets 8 and 9 have secured to their upper ends the studs 44 and 45 adapted to receive the round rods 46 and 47 which have secured to. their upper ends the magnet shunts 48 and 49, clamping screws 50 and 51 being provided to engage the rods 46 and 47 in any desired position. The magnet shunts 48 and,49 are made preferably of soft iron and are U-shaped in order to extend on both sides of the disk 5 in a position to lie adj a,- c'ent to the oles of the magnets 6 and 7, as a result 0 which depending upon their proximity to such poles, the shunts serve to divert the magnetic field created by the poles of the permanent magnets from assing through the retarding disk 5. Thus the binding screws 50 and 51 afford a convenient means for positively clamping the 'magnet shunts in any desired position and the cylindrical supports 46 and 47 afford a ready means for permitting angular adjustment of the shunts in order that they may occupy proper positions relatively to the poles of the magnets 6 and 7, Screws 52 and 53 of nonmagnetic material extend through -the magnet shunts in such a manner that their ends rest upon the magnets 6 and 7 to serve as, gages to determine the position of the shunts. Lock nuts 54 and 55 are provided to secure the gage screws 52 and 53 in any desired adjustment. Thus a ready means is provided for returning the magnet shunts to a previous adjustment if, for any reason, it

is necessary to remove them from the bracket? 6 and 9, as for example, when it is desired to remove the armature from the meter. threaded therethrough a bushing 56, which extends upward a sufficient distance to encircle the lower end of the armature shaft 2, the bore through the bushing being suiii- The lower bearing plate 3 has n ciently large to clear the shaft and permit 4 free rotation of the same. The bushing 56 has sl-idably fitted therein a plug 57 in the upper end of which a jewel is secured to constitute the lower bearing of the shaft. The plug 57 is normally held in an operative position by aspring 59, pivotally secured by the screw 60 to the bearing support 3 and in its operative position rotation of the spring 59 upon such screwis prevented by the engagement of a pin 61 with an-opening 62 formed in the spring, such ,pin 61 being rigidly supported by the lower bearing supdesire to claim any equivalent that may sug-- gest itself to those skilled in the art.

lVhat I claim is:

1. In an electric meter, the combination of an armature, a shaft for supporting such ar mature, a retarding disk mounted upon such shaft, a permanent magnet disposed with its sides substantially parallel with such retarding disk upon either side thereof, a slotted magnetic plate spanning the disk and adjustably supported in a plane substantially parallel with the ends of the magnet, and clamping means for securing such plate at any desired distance from the ends of the magnet.

2. In an electric meter, the combination of an armature, a shaft for supporting such ark mature, a retarding disk mounted upon such shaft, a permanent magnet disposed with its sides substantially parallel with such retarding disk upon either side thereof, a slotted magnetic shunt spanning the disk and adj ustably supported substantially p arallcl with the ends of the magnet, clamping means for securing such magnetic shunt at any desired distance from the ends in magnet, and a stop for determining the distance of the magnetic shunt flOIll the ends of the magnet.

3, In an electric meter, the combination of an armature, a shaft for supporting such armature, a retarding disk mounted upon such shaft, a permanent magnet disposed with its sides sul'istantially parallel with such retarding disk and upon either. side thereof, a slotted magnetic shunt spanning the disk and adj ustably supported substantially parallel with the ends of the magnet, clamping means for securing such magnetic shunt at any desired distance from the ends of the magnet, and a stop carried by such magnetic shunt for maintaining a practically constant air gap for remo a1 and replacement of such shunt.

In an electric meter, the combination of an armature, a shaft for supporting such armature, a retardingdisk mounted upon such tarding disk and upon either side thereof, a

slotted magnetic shunt spanning the disk and adjustably supported substantially par:

allel with the ends of the magnet, clamping means forsecurmg such magnetic shunt at any desired distance from the ends of the magnet, and a stop carried by such magnetic shunt for maintaining apracticallyconstant air gap for removal and replacement of such shunt, suchstop adjustable to secure any air gap desired. Y i

In witness whereof, I,hereunto subscribe my name this 28th day of December, A. I). 1.909.

WVitnesses ALBERT L. RABB, JOHN E. Scorn 

